# A tibble: 3 × 4
season n_obs min_date max_date
<dbl> <int> <date> <date>
1 2021 710 2021-08-02 2022-04-22
2 2022 614 2022-07-30 2023-04-14
3 2023 647 2023-07-01 2024-04-23
Banded Dotterel Moult Study
Exploration of dataset
Main conclusions since last meeting in Nov, 2024
Breeding plumage
Sex difference in maximum rufous band score (strong effect) Go to Results
- Males have a more full and immaculate rufous breast band than females
No age effect on maximum rufous band score Go to Results
Migratory-status difference in maximum rufous band score (weak, albiet significant effect) Go to Results
- Residents of both sexes have slightly more full and immaculate rufous breast bands than migrants
Pre-basic moult
No sex-specific timing of the pre-basic moult Go to Results
No migratory-status-specific timing of the pre-basic moult Go to Results
Age-specific timing of pre-basic moult (strong effect) Go to Results
- younger birds initiate their pre-basic moult earlier than older birds
Links to breeding activity
No effect of maximum rufous band score on prolonged breeding Go to Results
No effect of maximum rufous band score on early breeding Go to Results
No effect of prolonged breeding on maximum rufous band score Go to Results
No effect of prolonged breeding and timing of moult Go to Results
Positive relationship between the date when an individual was last seen with its maximum breeding plumage and the date when it was last observed breeding Go to Results
No age effect on prolonged breeding Go to Results
No age effect on early breeding Go to Results
Exploration of moult data extracted from photos
Note: data last modified 7-Nov-2024
This dataset contains the scored moult data for all usable photos from the 2021-2022, 2022-2023, and 2023-2024 breeding seasons at Kaikoura
check max and min dates for each season
summarize the number of individuals in the dataset
[1] 94
assess how many individuals have more than a single season of data
[1] 63
summarise the number of usable photos for each individual across the three seasons
the final dataset
Code
dat %>%
datatable(class = 'cell-border stripe', rownames = FALSE, filter = 'top')Plot the sampling distribution of Ailsa’s photos across the seasons
The “score” value is based on a scale from 1 to 7 describing the immaculate-ness and full-ness of the rufous breast band seen in the photos (Kok, Hogan, and Piersma (2020))